in the other hand, on a new disk, with a new clean install of OS X 10.5.6 ( with updates) NO problem at all. So, i need to reinstall and configure java to make it work on my current system.
Maybe terminal commands ?

Unfortunately, since PPC and 32-bit Intel platforms won't ever get an upgrade path to JRE 1.6, your only option as an end user is to not upgrade to 1.5.0_16. The other option would be to ask your application developers to look at the following:

This has been a known issue, especially for developers who use the JavaHelp system for providing application documentation, but as a user with a PPC machine, your only real option is to not upgrade your Java client to the latest version.